*  {
    padding: 0;
    margin: 0;
}
body {
    background-color: #fff;
}
a {
    text-decoration: none !important;
}
.nav {
    position: fixed;
    width: 100%;
    top: 0;
    background-color: #fff;
    z-index: 999;
    opacity: 0.8;
}
.head {
    margin-top: 12px;
}
.head ul li {
    display: inline-block;
}
.head ul li a {
    color: black;
    padding: 5px 10px;
    position: relative;
    font-size: 16px;
}
.head ul li a::after {
    content: "";
    position: absolute;
    right: 0;
    bottom: 0;
    background-color: darkcyan;
    height: 2px;
    width: 0;
    transition: all 0.2s;
}
.head ul li a:hover::after {
    left: 0;
    width: 100%;
}
/* 导航栏 */

.headimg {
    width: 100%;
    background-image: url(../images/head.jpg);
    height: 400px;
    background-position: 0px -300px;
    background-size: 100%;
}
/* 顶部背景图片 */

.content .col-xs-6{
    margin-top: 40px;
    height: 240px;
    background-image: url(../images/1000591.jpg);
    background-size: 100%;
    background-position: 0 30%;
    border-radius: 5px;
    transition: all 0.5s ease-out;
    text-align: center;
}
.content .col-xs-6 h3 {
    font-weight: 700;
}
.content .col-xs-6:hover {
    transform: scale(1.003,1.005);
    box-shadow: 2px 2px 10px dimgray;
}
.content .col-xs-6 h3 {
    color: #dededd;
    margin-top: 5%;
}